Samuel trethewey



(No Model.) 1

" S. TRETHEWEY.

ROTARY SHE ABS. 7

No. 479,037. Patented July 19', 189Z.

NIT'ED STATES PATENT OFFICE.

SAMUEL TRETHEWEY, OF PITTSBURG,PENNSYLVANIA, ASSIGNOR TO THE TRETHEWEYMANUFACTURING COMPANY, OF SAME PLACE.

ROTARY SHEARS.

SPECIFICATION forming part of Letters Patent No. 479,037, dated July 19,1892.

' Application filed June 30, 1891. $erial No. 398,028- (No model.)

To whom it may concern.-

Be it known that I, SAMUEL TRETHEWEY, a resident of Pittsburg, in thecounty of Allegheny and State of Pennsylvania, have invented a new anduseful Improvementin Rotary Shears; and I do hereby declare thefollowing to be afull, clear, and exact description thereof.

My invention relates to rotary shears, its

to object being to provide a form of apparatus which may be readilyadjusted for cutting sheets, plates, bars, 850., to diiferent lengths,and one which provides a convenient form of carriage for feeding thesheets, plates, bars,

&c., to the shears.

To enable others skilled in the art to make and use my invention, I willdescribe the same more fully, referring to the accompanying drawings, inwhich 2o Figure 1 is a side view, Fig. 2 a plan view, and Fig. 3 adetail sectional view, of one of the lower cutter-shafts, showing themanner of retaining the cutter securely in place. Fig. 4: is a sectionon the line 4 4, Fig. 3; and Fig.

5 is a View of the wedge employed.

Like letters indicate like parts.

The bed or frame A, which supports the apparatus, is composed of thehorizontal side beams a and the end cross-beams a, the said bed or frameresting on the underlying beams 6L2. J ournaled in suitable hearings inthe end cross-beams a of the bed A is the main shaft 1). In order toimpart a rotary movement to said shaft 1), a power-shaft c is situatedadjacent to the bed A, said power-shaft being j ournaled in bearings inthe standards (I. Atight and loose pulley e is mounted on the powershaft0 and is adapted to be driven by any suitable power. A pinion f issecured to the 6 power-shaft c and meshes with the large gearwheel 9 onthe main shaft 1). On the main shaft 1), just beyond the largegear-wheel g,is the pinion h, which meshes with a pinion t' on the lowershaft of the two cutter-shafts j j of the stationary rotary shears B.The stationary shears B are bolted or otherwise secured to the bed A,and they are composed of the upper and lower arms k 70', which extendout from the body portion 70 the said armsk k forming between them theslotZ. This slot 1 permits of the entrance'of the ends of sheets,plates, bars, 850., which extend beyond the cutters during the cuttingoperation. The cutter-shafts jj', arranged the one above the other, arejournaled in suitablebearingsin 55. the body portion k and in the arms70 7c of the stationary shears B. On the outer ends of the cutter-shaftsjj' are secured the cutters m m, circular in form and provided withcutting-edges. To provide for the vertical ad j ustment of the cutters mm to and from each other, I prefer to have the cutter-shafts j jjournaled in accordance with' the construction set forth in LettersPatent N 0. 429,072, granted to me May 27, 1890. To prevent any play ofthe lower cutter m and consequent displacement thereof with relation tothe upper cutter m-during the cutting operation, I provide the wedge 02,adapted to enter a suitable wedge-shaped slot or seat formed in thelower arm is. This wedge 01. when in position is adapted to bear againstthe flange n on the inner end of the bushing 0, as illustrated in Fig.8, and said wedge is retained therein by the nut n engaging with thethreaded neck 12 7 5 of said wedge. Since the cutter m isheld on theshaftj by the nut p, it is apparent that as the wedge 77. is forced intothe seat formed to receive it it will act through the flange 'n to driveback the bushing o, bringing a pressure to bear on the plate 19' on theinner end of the shaftj, thereby, through the nut 19 on the outer end ofsaid shaft, drawing back the cutter j. This will prevent anylongitudinal play or Wabbling on the part of said cutter m on the shaftjand will insure the perfect vertical adjustment of said outter, andconsequently an even regular cut.

As hereinbefore stated, the pinion h meshes with the pinion t' on thelower cutter-shaftj', and thus provides for the rotation of said shaftj.To impart a like rotary movement to the upper cutter-shaft j, the piniont' meshes with the pinion g on the said cutter-shaft j. A hanger orbracket q projects out over 5 the upper arm is, and in said hanger isjournaled the idle-roller g said roller being arranged at such height asto press on the upper surface of the sheets, plates, bars, 850., to becut as they pass between the cutters. This roller (1 serves to preventany tendency on the part of the sheets, plates, or bars to rise duringthe cutting operation.

The adjustableshears G are situated on the bed A opposite the stationaryshears B, and as the construction of the said adj ustable shears isexactly similar to that of the stationary shears the same letters ofreference and description as applied thereto are applicable withreference to the adjustable shears 0. Power to operate the cutter-shaftsof the adjustable shears G is obtained in the same manner from the mainshaft b.

The adjustable shears C are mounted in suitable guideways in the bed A,and to provide for the adjustment of said shears C at differentpositions on the bed A with relation to the stationary shears B theframe of the adjustable shears is constructed with the hanger 73in\vhichis journaled a pinion r. The pinion o" engages with the rack s 011the bed A,said pinion being operated bya handwheel 7", whereby upon therotation of said hand-wheel the adjustable shears C may be made toapproach and withdraw from the stationary shears B. Any other convenientform of mechanism for moving the adjustable shears C may, however, beemployed.

The track t is supported on the frame Abetween the stationary andadjustable shears and is provided with the rails t, upon which thewheels of the table or carriage u are adapted to travel. The track 15 isarranged parallel with the line of the cutting and may be moved,together with the carriage 1b, to or from the stationary shears B,according to the lengths of the sheets, plates, or bars to be cut.

To support the portions of the sheets, plates, or bars adjacent to thecutters during the cutting operation and prevent their sagging,idlerollers o 1: are employed. These rollers 11 21 are journaled insuitable standards of suiticient length to bring the tops of the rollerseven with the top of the lower cutters, as well as even with the top ofthe carriage u. The roller r may be secured at any position between thestationary and rotary shears as the adjustable shears C are broughtnearer or withdrawn farther from the stationary shears.

The operation of my improved rotary shears is as follows: By turning thehand-wheel 7' in the proper direction the adjustable shears C arebrought to the proper position relative to the stationary shears 13,according to the lengths of sheets, bars, or plates to be cut. Thecarriage 'lb and the idle-roller '0 are also brought to like positionsrelative to the lengths of the sheets to be cut. The cutters themselveshaving been adjusted properly, power is then applied to rotate thepower-shaft c,

whence power is transmitted through the connections described to operatethe cutter-shafts jj of the stationary and adjustable shears at auniform rate of speed. The sheets, plates, or bars, whetherin packs orsingly, are placed upon the carriage u, when said carriage is movedalong, the track t to bring the ends of the sheets, plates, or barsbetween the cutters m on, the idle-rollers o v acting to support sameadjacent to the point of cutting, and thereby preventing any sagging onthe part of the sheets, plates, or bars, and so insuring an even andregular out. At the same time the idle-rollers (1 press on the uppersurface of the sheets as they pass between the cutters and prevent anyupward movement on the part of said sheets. In case the lower cutters mbecome loose on the cutter-shafts, it is only necessary to tighten thenut a on the end of the wedge a, when said wedge, in the mannerhereinbefore described, will prevent any wabbling of the cutters andwill retain them in a perfect vertical position.

Ky the above construction I obtain doubleheaded rotary shears, which maybe adjusted for cutting sheets, plates, bars, the, to different lengths,greatly decreasing the time and labor of shearing.

\Vhat I claim as my invention, and desire to secure by Letters Patent,is-

1. In rotary shears, the combination, with a bed or frame, ofcutter-shafts journaled therein, cutters secured to said shafts, and abracket projecting out over the upper cutter and having a depending armcarrying a roller, said roller being adapted to press upon the upperface of the sheet, plate, &c., being cut, substantially as and for thepurposes set forth.

2. In rotary shears, the combination, with the frame, of cutter-shaftsjournaled therein, the one above the other, and a wedge-shaped keyengaging a flange on a bushing surrounding the lower cutter-shaft, saidkey aetingto force back the said cutter-shaft and prevent anylongitudinal movement on the part of the cutter secured thereto,substantially as and for the purposes set forth.

3. In rotary shears, the combination, with the frame, of the lowercutter-shaftj', a bushing 0, having the flange n, the wedge 72, theplate 19, secured to the shaftj', the cutter m, and nut 19,substantially as and for the purposes set forth.

In testimony whereof I, the said SAMUEL TRETHEWEY, have hereunto set myhand.

SAMUEL TRETI'IEWEY.

Witnesess:

Rom. D. TorrnN, J. N. CooKE.

